Motives

Although it still remains unclear what the Slenderman is, or what he wants with this dimension, one thing is very clear to me; Whatever it is, it is very dangerous to individuals.
I have looked into what eactly the Slenderman does, and no body really knows beyond that his victims are never seen again.

Through thier videos, the EverymanHYBRID crew seems to summon the Slenderman unknowingly.  This of course leads them to stop their viedo project and try to find out what is going on, and who or what Slenderman is.  Durring this investigation they discover something else, something different and a much more serious threat than Slenderman.

The creature that they discover is fast and dangerous, and seems to attack unprevoked and   seems to have the intent on killing it's victims.  This in my oppinion makes it much more dangerous than the Slenderman and raises a few more questions.
What is the creature?  Where did it come from?  Did the Slenderman Bring it with him? If so, for what purpose?  Are there more of these creatures?  and Can these creature also travel interdimensionally on their own?

Although I do not see Slenderman's pressance as an immediate threat the the security or the interdimensional boarders, I believe immediate action should be taken against the Slenderman, if only to find out what he wants and to stop watever he has planned.
Below I have included a video link that provided me with some background infromation about Slenderman,  i cant say how accurate it is, but it helped me understand what the Slenderman is.

Slender Man Documentary - Slender Suits: http://youtu.be/i0CPjq12R7s.